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Avalanche Advisory

Turnagain Area Avalanche Advisory
Thursday, March 20th 2014 6:35 am by Kevin Wright
ARCHIVED ADVISORY - All advisories expire after 24 hours from the posting date/time.
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The Bottom Line

Weather continues to be calm and sunny.  The snowpack has gotten more stable since the last storm.  However, the possibility still exists to trigger deep slab avalanches up to 5 feet deep in terrain over 35 degrees.  

MODERATE danger can be found in areas above treeline in steep terrain.  The likelihood of triggering a deep slab pocket is low, but the consequences to your health would be significant.

Below treeline the danger is LOW.  


 Show the Complete North American Avalanche Danger Scale
2 Moderate Alpine / Above 2,500' Travel Advice: Heightened avalanche conditions on specific terrain features. Evaluate snow and terrain carefully; identify features of concern.
1 Low Treeline / 1,000'-2,500' Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
1 Low Below Treeline / Below 1,000' Travel Advice: Generally safe avalanche conditions. Watch for unstable snow on isolated terrain features.
Avalanche Problem 1

It has been 5 days since we have had reports of major avalanche activity.  This is a good sign, as time goes on people are getting on increasingly agressive slopes and the snowpack is trending towards stable.  

Anyone riding in big, steep terrain must understand the possibility of a large avalanche still exists.  The slab/weak layer combination that caused the big avalanches last weekend is still present.  Both the slab and weak layer have gained strength over time, making it more difficult to trigger this problem.  But remember, this isn't our typical snow year.  The snowpack is shallow, and multiple crust layers have led to persistent weaknesses.  Click here for a writeup of the big avalanche in Seattle creek last weekend.

Steep terrain should be approached with a conservative mindset.  Ask yourself, "What would happen if this slope avalanched?"  


Avalanche Problem 2

Cornices are as big as we've seen them this year.  The photo is from last week of a section that dropped spontaneously, triggering a slab on the slope below.  

Check out this video for a good perspective of a close call with a cornice.

 


Mountain Weather

Perfect March weather would be accurate for the last few days.  Sunny skies, minimal wind, and comfortable temperatures.  

Today will bring more of the same.  Some clouds will roll in by the afternoon.  Wind will be calm, and temperatures rising with the sun exposure.  

For the long-term, we don't see any significant storms from now through the weekend.  A ridge across mainland Alaska is keeping the low pressure at bay.  

This is a general backcountry avalanche advisory issued for Turnagain Arm with Turnagain Pass as the core advisory area (this advisory does not apply to highways, railroads, or operating ski areas).

Winter snowmachine use open/closed status and riding conditions updates

Riding status is not associated with avalanche danger. An area will be open to motorized use in accordance to the Forest Management Plan when snow coverage is adequate to protect underlying vegetation. Backcountry hazards including avalanche hazard are always present regardless of the open status of motorized use areas.

(Updated: Apr 22, 2018 )

AREA STATUS WEATHER AND RIDING CONDITIONS
Glacier District
Johnson Pass: ClosedClosed as of April 20th
Placer River: ClosedClosed as of April 17th
Skookum Drainage: ClosedClosed as of April 1st.
Turnagain Pass: Open
Twentymile: ClosedClosed as of April 13th
Seward District
Carter Lake: Open
Lost Lake Trail: ClosedClosed as of April 13th
Primrose Trail: ClosedClosed as of April 13th
Resurrection Pass Trail: ClosedClosed as of April 20th
Snug Harbor: Open
South Fork Snow River Corridor: ClosedClosed as of April 13th
Summit Lake: ClosedClosed as of April 20th

Subscribe to the Turnagain Area Avalanche Advisory:

The information in this advisory is from the U.S. Forest Service, which is solely responsible for its content. This advisory describes general avalanche conditions and local variations always occur. This advisory provided by the Chugach National Forest, in partnership with Friends of the Chugach National Forest Avalanche Information Center.


USFS SNOW AND AVALANCHE HOTLINE (907) 754-2369
If you have comments or questions regarding CNFAIC operations or winter recreation management, please email staff@chugachavalanche.org
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